Questions

Hi :) I have a few questions I hope to get some help with!

1: When is the best age to breed a horse?

2: Whould I switch treats after awhile? I see some people only give turnips to Stallys and Carrots to mares for example. 

3: How dominant is the graying gene? How to avoid it? 

4: The health, can I improve "Poor" to good etc? And what should I think of when breeding?


Hope some of you are willing to help me out :) Thank you!